The Android Open Source Project | 7c1b96a | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | // |
| 18 | // Access to Zip archives. |
| 19 | // |
| 20 | |
| 21 | #define LOG_TAG "zip" |
| 22 | |
| 23 | #include "utils/ZipFile.h" |
| 24 | #include "utils/ZipUtils.h" |
| 25 | #include "utils/Log.h" |
| 26 | |
| 27 | #include <zlib.h> |
| 28 | #define DEF_MEM_LEVEL 8 // normally in zutil.h? |
| 29 | |
| 30 | #include <memory.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <errno.h> |
| 33 | #include <assert.h> |
| 34 | |
| 35 | using namespace android; |
| 36 | |
| 37 | /* |
| 38 | * Some environments require the "b", some choke on it. |
| 39 | */ |
| 40 | #define FILE_OPEN_RO "rb" |
| 41 | #define FILE_OPEN_RW "r+b" |
| 42 | #define FILE_OPEN_RW_CREATE "w+b" |
| 43 | |
| 44 | /* should live somewhere else? */ |
| 45 | static status_t errnoToStatus(int err) |
| 46 | { |
| 47 | if (err == ENOENT) |
| 48 | return NAME_NOT_FOUND; |
| 49 | else if (err == EACCES) |
| 50 | return PERMISSION_DENIED; |
| 51 | else |
| 52 | return UNKNOWN_ERROR; |
| 53 | } |
| 54 | |
| 55 | /* |
| 56 | * Open a file and parse its guts. |
| 57 | */ |
| 58 | status_t ZipFile::open(const char* zipFileName, int flags) |
| 59 | { |
| 60 | bool newArchive = false; |
| 61 | |
| 62 | assert(mZipFp == NULL); // no reopen |
| 63 | |
| 64 | if ((flags & kOpenTruncate)) |
| 65 | flags |= kOpenCreate; // trunc implies create |
| 66 | |
| 67 | if ((flags & kOpenReadOnly) && (flags & kOpenReadWrite)) |
| 68 | return INVALID_OPERATION; // not both |
| 69 | if (!((flags & kOpenReadOnly) || (flags & kOpenReadWrite))) |
| 70 | return INVALID_OPERATION; // not neither |
| 71 | if ((flags & kOpenCreate) && !(flags & kOpenReadWrite)) |
| 72 | return INVALID_OPERATION; // create requires write |
| 73 | |
| 74 | if (flags & kOpenTruncate) { |
| 75 | newArchive = true; |
| 76 | } else { |
| 77 | newArchive = (access(zipFileName, F_OK) != 0); |
| 78 | if (!(flags & kOpenCreate) && newArchive) { |
| 79 | /* not creating, must already exist */ |
| 80 | LOGD("File %s does not exist", zipFileName); |
| 81 | return NAME_NOT_FOUND; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | /* open the file */ |
| 86 | const char* openflags; |
| 87 | if (flags & kOpenReadWrite) { |
| 88 | if (newArchive) |
| 89 | openflags = FILE_OPEN_RW_CREATE; |
| 90 | else |
| 91 | openflags = FILE_OPEN_RW; |
| 92 | } else { |
| 93 | openflags = FILE_OPEN_RO; |
| 94 | } |
| 95 | mZipFp = fopen(zipFileName, openflags); |
| 96 | if (mZipFp == NULL) { |
| 97 | int err = errno; |
| 98 | LOGD("fopen failed: %d\n", err); |
| 99 | return errnoToStatus(err); |
| 100 | } |
| 101 | |
| 102 | status_t result; |
| 103 | if (!newArchive) { |
| 104 | /* |
| 105 | * Load the central directory. If that fails, then this probably |
| 106 | * isn't a Zip archive. |
| 107 | */ |
| 108 | result = readCentralDir(); |
| 109 | } else { |
| 110 | /* |
| 111 | * Newly-created. The EndOfCentralDir constructor actually |
| 112 | * sets everything to be the way we want it (all zeroes). We |
| 113 | * set mNeedCDRewrite so that we create *something* if the |
| 114 | * caller doesn't add any files. (We could also just unlink |
| 115 | * the file if it's brand new and nothing was added, but that's |
| 116 | * probably doing more than we really should -- the user might |
| 117 | * have a need for empty zip files.) |
| 118 | */ |
| 119 | mNeedCDRewrite = true; |
| 120 | result = NO_ERROR; |
| 121 | } |
| 122 | |
| 123 | if (flags & kOpenReadOnly) |
| 124 | mReadOnly = true; |
| 125 | else |
| 126 | assert(!mReadOnly); |
| 127 | |
| 128 | return result; |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * Return the Nth entry in the archive. |
| 133 | */ |
| 134 | ZipEntry* ZipFile::getEntryByIndex(int idx) const |
| 135 | { |
| 136 | if (idx < 0 || idx >= (int) mEntries.size()) |
| 137 | return NULL; |
| 138 | |
| 139 | return mEntries[idx]; |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Find an entry by name. |
| 144 | */ |
| 145 | ZipEntry* ZipFile::getEntryByName(const char* fileName) const |
| 146 | { |
| 147 | /* |
| 148 | * Do a stupid linear string-compare search. |
| 149 | * |
| 150 | * There are various ways to speed this up, especially since it's rare |
| 151 | * to intermingle changes to the archive with "get by name" calls. We |
| 152 | * don't want to sort the mEntries vector itself, however, because |
| 153 | * it's used to recreate the Central Directory. |
| 154 | * |
| 155 | * (Hash table works, parallel list of pointers in sorted order is good.) |
| 156 | */ |
| 157 | int idx; |
| 158 | |
| 159 | for (idx = mEntries.size()-1; idx >= 0; idx--) { |
| 160 | ZipEntry* pEntry = mEntries[idx]; |
| 161 | if (!pEntry->getDeleted() && |
| 162 | strcmp(fileName, pEntry->getFileName()) == 0) |
| 163 | { |
| 164 | return pEntry; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | return NULL; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Empty the mEntries vector. |
| 173 | */ |
| 174 | void ZipFile::discardEntries(void) |
| 175 | { |
| 176 | int count = mEntries.size(); |
| 177 | |
| 178 | while (--count >= 0) |
| 179 | delete mEntries[count]; |
| 180 | |
| 181 | mEntries.clear(); |
| 182 | } |
| 183 | |
| 184 | |
| 185 | /* |
| 186 | * Find the central directory and read the contents. |
| 187 | * |
| 188 | * The fun thing about ZIP archives is that they may or may not be |
| 189 | * readable from start to end. In some cases, notably for archives |
| 190 | * that were written to stdout, the only length information is in the |
| 191 | * central directory at the end of the file. |
| 192 | * |
| 193 | * Of course, the central directory can be followed by a variable-length |
| 194 | * comment field, so we have to scan through it backwards. The comment |
| 195 | * is at most 64K, plus we have 18 bytes for the end-of-central-dir stuff |
| 196 | * itself, plus apparently sometimes people throw random junk on the end |
| 197 | * just for the fun of it. |
| 198 | * |
| 199 | * This is all a little wobbly. If the wrong value ends up in the EOCD |
| 200 | * area, we're hosed. This appears to be the way that everbody handles |
| 201 | * it though, so we're in pretty good company if this fails. |
| 202 | */ |
| 203 | status_t ZipFile::readCentralDir(void) |
| 204 | { |
| 205 | status_t result = NO_ERROR; |
| 206 | unsigned char* buf = NULL; |
| 207 | off_t fileLength, seekStart; |
| 208 | long readAmount; |
| 209 | int i; |
| 210 | |
| 211 | fseek(mZipFp, 0, SEEK_END); |
| 212 | fileLength = ftell(mZipFp); |
| 213 | rewind(mZipFp); |
| 214 | |
| 215 | /* too small to be a ZIP archive? */ |
| 216 | if (fileLength < EndOfCentralDir::kEOCDLen) { |
| 217 | LOGD("Length is %ld -- too small\n", (long)fileLength); |
| 218 | result = INVALID_OPERATION; |
| 219 | goto bail; |
| 220 | } |
| 221 | |
| 222 | buf = new unsigned char[EndOfCentralDir::kMaxEOCDSearch]; |
| 223 | if (buf == NULL) { |
| 224 | LOGD("Failure allocating %d bytes for EOCD search", |
| 225 | EndOfCentralDir::kMaxEOCDSearch); |
| 226 | result = NO_MEMORY; |
| 227 | goto bail; |
| 228 | } |
| 229 | |
| 230 | if (fileLength > EndOfCentralDir::kMaxEOCDSearch) { |
| 231 | seekStart = fileLength - EndOfCentralDir::kMaxEOCDSearch; |
| 232 | readAmount = EndOfCentralDir::kMaxEOCDSearch; |
| 233 | } else { |
| 234 | seekStart = 0; |
| 235 | readAmount = (long) fileLength; |
| 236 | } |
| 237 | if (fseek(mZipFp, seekStart, SEEK_SET) != 0) { |
| 238 | LOGD("Failure seeking to end of zip at %ld", (long) seekStart); |
| 239 | result = UNKNOWN_ERROR; |
| 240 | goto bail; |
| 241 | } |
| 242 | |
| 243 | /* read the last part of the file into the buffer */ |
| 244 | if (fread(buf, 1, readAmount, mZipFp) != (size_t) readAmount) { |
| 245 | LOGD("short file? wanted %ld\n", readAmount); |
| 246 | result = UNKNOWN_ERROR; |
| 247 | goto bail; |
| 248 | } |
| 249 | |
| 250 | /* find the end-of-central-dir magic */ |
| 251 | for (i = readAmount - 4; i >= 0; i--) { |
| 252 | if (buf[i] == 0x50 && |
| 253 | ZipEntry::getLongLE(&buf[i]) == EndOfCentralDir::kSignature) |
| 254 | { |
| 255 | LOGV("+++ Found EOCD at buf+%d\n", i); |
| 256 | break; |
| 257 | } |
| 258 | } |
| 259 | if (i < 0) { |
| 260 | LOGD("EOCD not found, not Zip\n"); |
| 261 | result = INVALID_OPERATION; |
| 262 | goto bail; |
| 263 | } |
| 264 | |
| 265 | /* extract eocd values */ |
| 266 | result = mEOCD.readBuf(buf + i, readAmount - i); |
| 267 | if (result != NO_ERROR) { |
| 268 | LOGD("Failure reading %ld bytes of EOCD values", readAmount - i); |
| 269 | goto bail; |
| 270 | } |
| 271 | //mEOCD.dump(); |
| 272 | |
| 273 | if (mEOCD.mDiskNumber != 0 || mEOCD.mDiskWithCentralDir != 0 || |
| 274 | mEOCD.mNumEntries != mEOCD.mTotalNumEntries) |
| 275 | { |
| 276 | LOGD("Archive spanning not supported\n"); |
| 277 | result = INVALID_OPERATION; |
| 278 | goto bail; |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * So far so good. "mCentralDirSize" is the size in bytes of the |
| 283 | * central directory, so we can just seek back that far to find it. |
| 284 | * We can also seek forward mCentralDirOffset bytes from the |
| 285 | * start of the file. |
| 286 | * |
| 287 | * We're not guaranteed to have the rest of the central dir in the |
| 288 | * buffer, nor are we guaranteed that the central dir will have any |
| 289 | * sort of convenient size. We need to skip to the start of it and |
| 290 | * read the header, then the other goodies. |
| 291 | * |
| 292 | * The only thing we really need right now is the file comment, which |
| 293 | * we're hoping to preserve. |
| 294 | */ |
| 295 | if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) { |
| 296 | LOGD("Failure seeking to central dir offset %ld\n", |
| 297 | mEOCD.mCentralDirOffset); |
| 298 | result = UNKNOWN_ERROR; |
| 299 | goto bail; |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * Loop through and read the central dir entries. |
| 304 | */ |
| 305 | LOGV("Scanning %d entries...\n", mEOCD.mTotalNumEntries); |
| 306 | int entry; |
| 307 | for (entry = 0; entry < mEOCD.mTotalNumEntries; entry++) { |
| 308 | ZipEntry* pEntry = new ZipEntry; |
| 309 | |
| 310 | result = pEntry->initFromCDE(mZipFp); |
| 311 | if (result != NO_ERROR) { |
| 312 | LOGD("initFromCDE failed\n"); |
| 313 | delete pEntry; |
| 314 | goto bail; |
| 315 | } |
| 316 | |
| 317 | mEntries.add(pEntry); |
| 318 | } |
| 319 | |
| 320 | |
| 321 | /* |
| 322 | * If all went well, we should now be back at the EOCD. |
| 323 | */ |
| 324 | { |
| 325 | unsigned char checkBuf[4]; |
| 326 | if (fread(checkBuf, 1, 4, mZipFp) != 4) { |
| 327 | LOGD("EOCD check read failed\n"); |
| 328 | result = INVALID_OPERATION; |
| 329 | goto bail; |
| 330 | } |
| 331 | if (ZipEntry::getLongLE(checkBuf) != EndOfCentralDir::kSignature) { |
| 332 | LOGD("EOCD read check failed\n"); |
| 333 | result = UNKNOWN_ERROR; |
| 334 | goto bail; |
| 335 | } |
| 336 | LOGV("+++ EOCD read check passed\n"); |
| 337 | } |
| 338 | |
| 339 | bail: |
| 340 | delete[] buf; |
| 341 | return result; |
| 342 | } |
| 343 | |
| 344 | |
| 345 | /* |
| 346 | * Add a new file to the archive. |
| 347 | * |
| 348 | * This requires creating and populating a ZipEntry structure, and copying |
| 349 | * the data into the file at the appropriate position. The "appropriate |
| 350 | * position" is the current location of the central directory, which we |
| 351 | * casually overwrite (we can put it back later). |
| 352 | * |
| 353 | * If we were concerned about safety, we would want to make all changes |
| 354 | * in a temp file and then overwrite the original after everything was |
| 355 | * safely written. Not really a concern for us. |
| 356 | */ |
| 357 | status_t ZipFile::addCommon(const char* fileName, const void* data, size_t size, |
| 358 | const char* storageName, int sourceType, int compressionMethod, |
| 359 | ZipEntry** ppEntry) |
| 360 | { |
| 361 | ZipEntry* pEntry = NULL; |
| 362 | status_t result = NO_ERROR; |
| 363 | long lfhPosn, startPosn, endPosn, uncompressedLen; |
| 364 | FILE* inputFp = NULL; |
| 365 | unsigned long crc; |
| 366 | time_t modWhen; |
| 367 | |
| 368 | if (mReadOnly) |
| 369 | return INVALID_OPERATION; |
| 370 | |
| 371 | assert(compressionMethod == ZipEntry::kCompressDeflated || |
| 372 | compressionMethod == ZipEntry::kCompressStored); |
| 373 | |
| 374 | /* make sure we're in a reasonable state */ |
| 375 | assert(mZipFp != NULL); |
| 376 | assert(mEntries.size() == mEOCD.mTotalNumEntries); |
| 377 | |
| 378 | /* make sure it doesn't already exist */ |
| 379 | if (getEntryByName(storageName) != NULL) |
| 380 | return ALREADY_EXISTS; |
| 381 | |
| 382 | if (!data) { |
| 383 | inputFp = fopen(fileName, FILE_OPEN_RO); |
| 384 | if (inputFp == NULL) |
| 385 | return errnoToStatus(errno); |
| 386 | } |
| 387 | |
| 388 | if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) { |
| 389 | result = UNKNOWN_ERROR; |
| 390 | goto bail; |
| 391 | } |
| 392 | |
| 393 | pEntry = new ZipEntry; |
| 394 | pEntry->initNew(storageName, NULL); |
| 395 | |
| 396 | /* |
| 397 | * From here on out, failures are more interesting. |
| 398 | */ |
| 399 | mNeedCDRewrite = true; |
| 400 | |
| 401 | /* |
| 402 | * Write the LFH, even though it's still mostly blank. We need it |
| 403 | * as a place-holder. In theory the LFH isn't necessary, but in |
| 404 | * practice some utilities demand it. |
| 405 | */ |
| 406 | lfhPosn = ftell(mZipFp); |
| 407 | pEntry->mLFH.write(mZipFp); |
| 408 | startPosn = ftell(mZipFp); |
| 409 | |
| 410 | /* |
| 411 | * Copy the data in, possibly compressing it as we go. |
| 412 | */ |
| 413 | if (sourceType == ZipEntry::kCompressStored) { |
| 414 | if (compressionMethod == ZipEntry::kCompressDeflated) { |
| 415 | bool failed = false; |
| 416 | result = compressFpToFp(mZipFp, inputFp, data, size, &crc); |
| 417 | if (result != NO_ERROR) { |
| 418 | LOGD("compression failed, storing\n"); |
| 419 | failed = true; |
| 420 | } else { |
| 421 | /* |
| 422 | * Make sure it has compressed "enough". This probably ought |
| 423 | * to be set through an API call, but I don't expect our |
| 424 | * criteria to change over time. |
| 425 | */ |
| 426 | long src = inputFp ? ftell(inputFp) : size; |
| 427 | long dst = ftell(mZipFp) - startPosn; |
| 428 | if (dst + (dst / 10) > src) { |
| 429 | LOGD("insufficient compression (src=%ld dst=%ld), storing\n", |
| 430 | src, dst); |
| 431 | failed = true; |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | if (failed) { |
| 436 | compressionMethod = ZipEntry::kCompressStored; |
| 437 | if (inputFp) rewind(inputFp); |
| 438 | fseek(mZipFp, startPosn, SEEK_SET); |
| 439 | /* fall through to kCompressStored case */ |
| 440 | } |
| 441 | } |
| 442 | /* handle "no compression" request, or failed compression from above */ |
| 443 | if (compressionMethod == ZipEntry::kCompressStored) { |
| 444 | if (inputFp) { |
| 445 | result = copyFpToFp(mZipFp, inputFp, &crc); |
| 446 | } else { |
| 447 | result = copyDataToFp(mZipFp, data, size, &crc); |
| 448 | } |
| 449 | if (result != NO_ERROR) { |
| 450 | // don't need to truncate; happens in CDE rewrite |
| 451 | LOGD("failed copying data in\n"); |
| 452 | goto bail; |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | // currently seeked to end of file |
| 457 | uncompressedLen = inputFp ? ftell(inputFp) : size; |
| 458 | } else if (sourceType == ZipEntry::kCompressDeflated) { |
| 459 | /* we should support uncompressed-from-compressed, but it's not |
| 460 | * important right now */ |
| 461 | assert(compressionMethod == ZipEntry::kCompressDeflated); |
| 462 | |
| 463 | bool scanResult; |
| 464 | int method; |
| 465 | long compressedLen; |
| 466 | |
| 467 | scanResult = ZipUtils::examineGzip(inputFp, &method, &uncompressedLen, |
| 468 | &compressedLen, &crc); |
| 469 | if (!scanResult || method != ZipEntry::kCompressDeflated) { |
| 470 | LOGD("this isn't a deflated gzip file?"); |
| 471 | result = UNKNOWN_ERROR; |
| 472 | goto bail; |
| 473 | } |
| 474 | |
| 475 | result = copyPartialFpToFp(mZipFp, inputFp, compressedLen, NULL); |
| 476 | if (result != NO_ERROR) { |
| 477 | LOGD("failed copying gzip data in\n"); |
| 478 | goto bail; |
| 479 | } |
| 480 | } else { |
| 481 | assert(false); |
| 482 | result = UNKNOWN_ERROR; |
| 483 | goto bail; |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * We could write the "Data Descriptor", but there doesn't seem to |
| 488 | * be any point since we're going to go back and write the LFH. |
| 489 | * |
| 490 | * Update file offsets. |
| 491 | */ |
| 492 | endPosn = ftell(mZipFp); // seeked to end of compressed data |
| 493 | |
| 494 | /* |
| 495 | * Success! Fill out new values. |
| 496 | */ |
| 497 | pEntry->setDataInfo(uncompressedLen, endPosn - startPosn, crc, |
| 498 | compressionMethod); |
| 499 | modWhen = getModTime(inputFp ? fileno(inputFp) : fileno(mZipFp)); |
| 500 | pEntry->setModWhen(modWhen); |
| 501 | pEntry->setLFHOffset(lfhPosn); |
| 502 | mEOCD.mNumEntries++; |
| 503 | mEOCD.mTotalNumEntries++; |
| 504 | mEOCD.mCentralDirSize = 0; // mark invalid; set by flush() |
| 505 | mEOCD.mCentralDirOffset = endPosn; |
| 506 | |
| 507 | /* |
| 508 | * Go back and write the LFH. |
| 509 | */ |
| 510 | if (fseek(mZipFp, lfhPosn, SEEK_SET) != 0) { |
| 511 | result = UNKNOWN_ERROR; |
| 512 | goto bail; |
| 513 | } |
| 514 | pEntry->mLFH.write(mZipFp); |
| 515 | |
| 516 | /* |
| 517 | * Add pEntry to the list. |
| 518 | */ |
| 519 | mEntries.add(pEntry); |
| 520 | if (ppEntry != NULL) |
| 521 | *ppEntry = pEntry; |
| 522 | pEntry = NULL; |
| 523 | |
| 524 | bail: |
| 525 | if (inputFp != NULL) |
| 526 | fclose(inputFp); |
| 527 | delete pEntry; |
| 528 | return result; |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Add an entry by copying it from another zip file. If "padding" is |
| 533 | * nonzero, the specified number of bytes will be added to the "extra" |
| 534 | * field in the header. |
| 535 | * |
| 536 | * If "ppEntry" is non-NULL, a pointer to the new entry will be returned. |
| 537 | */ |
| 538 | status_t ZipFile::add(const ZipFile* pSourceZip, const ZipEntry* pSourceEntry, |
| 539 | int padding, ZipEntry** ppEntry) |
| 540 | { |
| 541 | ZipEntry* pEntry = NULL; |
| 542 | status_t result; |
| 543 | long lfhPosn, endPosn; |
| 544 | |
| 545 | if (mReadOnly) |
| 546 | return INVALID_OPERATION; |
| 547 | |
| 548 | /* make sure we're in a reasonable state */ |
| 549 | assert(mZipFp != NULL); |
| 550 | assert(mEntries.size() == mEOCD.mTotalNumEntries); |
| 551 | |
| 552 | if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) { |
| 553 | result = UNKNOWN_ERROR; |
| 554 | goto bail; |
| 555 | } |
| 556 | |
| 557 | pEntry = new ZipEntry; |
| 558 | if (pEntry == NULL) { |
| 559 | result = NO_MEMORY; |
| 560 | goto bail; |
| 561 | } |
| 562 | |
| 563 | result = pEntry->initFromExternal(pSourceZip, pSourceEntry); |
| 564 | if (result != NO_ERROR) |
| 565 | goto bail; |
| 566 | if (padding != 0) { |
| 567 | result = pEntry->addPadding(padding); |
| 568 | if (result != NO_ERROR) |
| 569 | goto bail; |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * From here on out, failures are more interesting. |
| 574 | */ |
| 575 | mNeedCDRewrite = true; |
| 576 | |
| 577 | /* |
| 578 | * Write the LFH. Since we're not recompressing the data, we already |
| 579 | * have all of the fields filled out. |
| 580 | */ |
| 581 | lfhPosn = ftell(mZipFp); |
| 582 | pEntry->mLFH.write(mZipFp); |
| 583 | |
| 584 | /* |
| 585 | * Copy the data over. |
| 586 | * |
| 587 | * If the "has data descriptor" flag is set, we want to copy the DD |
| 588 | * fields as well. This is a fixed-size area immediately following |
| 589 | * the data. |
| 590 | */ |
| 591 | if (fseek(pSourceZip->mZipFp, pSourceEntry->getFileOffset(), SEEK_SET) != 0) |
| 592 | { |
| 593 | result = UNKNOWN_ERROR; |
| 594 | goto bail; |
| 595 | } |
| 596 | |
| 597 | off_t copyLen; |
| 598 | copyLen = pSourceEntry->getCompressedLen(); |
| 599 | if ((pSourceEntry->mLFH.mGPBitFlag & ZipEntry::kUsesDataDescr) != 0) |
| 600 | copyLen += ZipEntry::kDataDescriptorLen; |
| 601 | |
| 602 | if (copyPartialFpToFp(mZipFp, pSourceZip->mZipFp, copyLen, NULL) |
| 603 | != NO_ERROR) |
| 604 | { |
| 605 | LOGW("copy of '%s' failed\n", pEntry->mCDE.mFileName); |
| 606 | result = UNKNOWN_ERROR; |
| 607 | goto bail; |
| 608 | } |
| 609 | |
| 610 | /* |
| 611 | * Update file offsets. |
| 612 | */ |
| 613 | endPosn = ftell(mZipFp); |
| 614 | |
| 615 | /* |
| 616 | * Success! Fill out new values. |
| 617 | */ |
| 618 | pEntry->setLFHOffset(lfhPosn); // sets mCDE.mLocalHeaderRelOffset |
| 619 | mEOCD.mNumEntries++; |
| 620 | mEOCD.mTotalNumEntries++; |
| 621 | mEOCD.mCentralDirSize = 0; // mark invalid; set by flush() |
| 622 | mEOCD.mCentralDirOffset = endPosn; |
| 623 | |
| 624 | /* |
| 625 | * Add pEntry to the list. |
| 626 | */ |
| 627 | mEntries.add(pEntry); |
| 628 | if (ppEntry != NULL) |
| 629 | *ppEntry = pEntry; |
| 630 | pEntry = NULL; |
| 631 | |
| 632 | result = NO_ERROR; |
| 633 | |
| 634 | bail: |
| 635 | delete pEntry; |
| 636 | return result; |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Copy all of the bytes in "src" to "dst". |
| 641 | * |
| 642 | * On exit, "srcFp" will be seeked to the end of the file, and "dstFp" |
| 643 | * will be seeked immediately past the data. |
| 644 | */ |
| 645 | status_t ZipFile::copyFpToFp(FILE* dstFp, FILE* srcFp, unsigned long* pCRC32) |
| 646 | { |
| 647 | unsigned char tmpBuf[32768]; |
| 648 | size_t count; |
| 649 | |
| 650 | *pCRC32 = crc32(0L, Z_NULL, 0); |
| 651 | |
| 652 | while (1) { |
| 653 | count = fread(tmpBuf, 1, sizeof(tmpBuf), srcFp); |
| 654 | if (ferror(srcFp) || ferror(dstFp)) |
| 655 | return errnoToStatus(errno); |
| 656 | if (count == 0) |
| 657 | break; |
| 658 | |
| 659 | *pCRC32 = crc32(*pCRC32, tmpBuf, count); |
| 660 | |
| 661 | if (fwrite(tmpBuf, 1, count, dstFp) != count) { |
| 662 | LOGD("fwrite %d bytes failed\n", (int) count); |
| 663 | return UNKNOWN_ERROR; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | return NO_ERROR; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * Copy all of the bytes in "src" to "dst". |
| 672 | * |
| 673 | * On exit, "dstFp" will be seeked immediately past the data. |
| 674 | */ |
| 675 | status_t ZipFile::copyDataToFp(FILE* dstFp, |
| 676 | const void* data, size_t size, unsigned long* pCRC32) |
| 677 | { |
| 678 | size_t count; |
| 679 | |
| 680 | *pCRC32 = crc32(0L, Z_NULL, 0); |
| 681 | if (size > 0) { |
| 682 | *pCRC32 = crc32(*pCRC32, (const unsigned char*)data, size); |
| 683 | if (fwrite(data, 1, size, dstFp) != size) { |
| 684 | LOGD("fwrite %d bytes failed\n", (int) size); |
| 685 | return UNKNOWN_ERROR; |
| 686 | } |
| 687 | } |
| 688 | |
| 689 | return NO_ERROR; |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * Copy some of the bytes in "src" to "dst". |
| 694 | * |
| 695 | * If "pCRC32" is NULL, the CRC will not be computed. |
| 696 | * |
| 697 | * On exit, "srcFp" will be seeked to the end of the file, and "dstFp" |
| 698 | * will be seeked immediately past the data just written. |
| 699 | */ |
| 700 | status_t ZipFile::copyPartialFpToFp(FILE* dstFp, FILE* srcFp, long length, |
| 701 | unsigned long* pCRC32) |
| 702 | { |
| 703 | unsigned char tmpBuf[32768]; |
| 704 | size_t count; |
| 705 | |
| 706 | if (pCRC32 != NULL) |
| 707 | *pCRC32 = crc32(0L, Z_NULL, 0); |
| 708 | |
| 709 | while (length) { |
| 710 | long readSize; |
| 711 | |
| 712 | readSize = sizeof(tmpBuf); |
| 713 | if (readSize > length) |
| 714 | readSize = length; |
| 715 | |
| 716 | count = fread(tmpBuf, 1, readSize, srcFp); |
| 717 | if ((long) count != readSize) { // error or unexpected EOF |
| 718 | LOGD("fread %d bytes failed\n", (int) readSize); |
| 719 | return UNKNOWN_ERROR; |
| 720 | } |
| 721 | |
| 722 | if (pCRC32 != NULL) |
| 723 | *pCRC32 = crc32(*pCRC32, tmpBuf, count); |
| 724 | |
| 725 | if (fwrite(tmpBuf, 1, count, dstFp) != count) { |
| 726 | LOGD("fwrite %d bytes failed\n", (int) count); |
| 727 | return UNKNOWN_ERROR; |
| 728 | } |
| 729 | |
| 730 | length -= readSize; |
| 731 | } |
| 732 | |
| 733 | return NO_ERROR; |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | * Compress all of the data in "srcFp" and write it to "dstFp". |
| 738 | * |
| 739 | * On exit, "srcFp" will be seeked to the end of the file, and "dstFp" |
| 740 | * will be seeked immediately past the compressed data. |
| 741 | */ |
| 742 | status_t ZipFile::compressFpToFp(FILE* dstFp, FILE* srcFp, |
| 743 | const void* data, size_t size, unsigned long* pCRC32) |
| 744 | { |
| 745 | status_t result = NO_ERROR; |
| 746 | const size_t kBufSize = 32768; |
| 747 | unsigned char* inBuf = NULL; |
| 748 | unsigned char* outBuf = NULL; |
| 749 | z_stream zstream; |
| 750 | bool atEof = false; // no feof() aviailable yet |
| 751 | unsigned long crc; |
| 752 | int zerr; |
| 753 | |
| 754 | /* |
| 755 | * Create an input buffer and an output buffer. |
| 756 | */ |
| 757 | inBuf = new unsigned char[kBufSize]; |
| 758 | outBuf = new unsigned char[kBufSize]; |
| 759 | if (inBuf == NULL || outBuf == NULL) { |
| 760 | result = NO_MEMORY; |
| 761 | goto bail; |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * Initialize the zlib stream. |
| 766 | */ |
| 767 | memset(&zstream, 0, sizeof(zstream)); |
| 768 | zstream.zalloc = Z_NULL; |
| 769 | zstream.zfree = Z_NULL; |
| 770 | zstream.opaque = Z_NULL; |
| 771 | zstream.next_in = NULL; |
| 772 | zstream.avail_in = 0; |
| 773 | zstream.next_out = outBuf; |
| 774 | zstream.avail_out = kBufSize; |
| 775 | zstream.data_type = Z_UNKNOWN; |
| 776 | |
| 777 | zerr = deflateInit2(&zstream, Z_BEST_COMPRESSION, |
| 778 | Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY); |
| 779 | if (zerr != Z_OK) { |
| 780 | result = UNKNOWN_ERROR; |
| 781 | if (zerr == Z_VERSION_ERROR) { |
| 782 | LOGE("Installed zlib is not compatible with linked version (%s)\n", |
| 783 | ZLIB_VERSION); |
| 784 | } else { |
| 785 | LOGD("Call to deflateInit2 failed (zerr=%d)\n", zerr); |
| 786 | } |
| 787 | goto bail; |
| 788 | } |
| 789 | |
| 790 | crc = crc32(0L, Z_NULL, 0); |
| 791 | |
| 792 | /* |
| 793 | * Loop while we have data. |
| 794 | */ |
| 795 | do { |
| 796 | size_t getSize; |
| 797 | int flush; |
| 798 | |
| 799 | /* only read if the input buffer is empty */ |
| 800 | if (zstream.avail_in == 0 && !atEof) { |
| 801 | LOGV("+++ reading %d bytes\n", (int)kBufSize); |
| 802 | if (data) { |
| 803 | getSize = size > kBufSize ? kBufSize : size; |
| 804 | memcpy(inBuf, data, getSize); |
| 805 | data = ((const char*)data) + getSize; |
| 806 | size -= getSize; |
| 807 | } else { |
| 808 | getSize = fread(inBuf, 1, kBufSize, srcFp); |
| 809 | if (ferror(srcFp)) { |
| 810 | LOGD("deflate read failed (errno=%d)\n", errno); |
| 811 | goto z_bail; |
| 812 | } |
| 813 | } |
| 814 | if (getSize < kBufSize) { |
| 815 | LOGV("+++ got %d bytes, EOF reached\n", |
| 816 | (int)getSize); |
| 817 | atEof = true; |
| 818 | } |
| 819 | |
| 820 | crc = crc32(crc, inBuf, getSize); |
| 821 | |
| 822 | zstream.next_in = inBuf; |
| 823 | zstream.avail_in = getSize; |
| 824 | } |
| 825 | |
| 826 | if (atEof) |
| 827 | flush = Z_FINISH; /* tell zlib that we're done */ |
| 828 | else |
| 829 | flush = Z_NO_FLUSH; /* more to come! */ |
| 830 | |
| 831 | zerr = deflate(&zstream, flush); |
| 832 | if (zerr != Z_OK && zerr != Z_STREAM_END) { |
| 833 | LOGD("zlib deflate call failed (zerr=%d)\n", zerr); |
| 834 | result = UNKNOWN_ERROR; |
| 835 | goto z_bail; |
| 836 | } |
| 837 | |
| 838 | /* write when we're full or when we're done */ |
| 839 | if (zstream.avail_out == 0 || |
| 840 | (zerr == Z_STREAM_END && zstream.avail_out != (uInt) kBufSize)) |
| 841 | { |
| 842 | LOGV("+++ writing %d bytes\n", (int) (zstream.next_out - outBuf)); |
| 843 | if (fwrite(outBuf, 1, zstream.next_out - outBuf, dstFp) != |
| 844 | (size_t)(zstream.next_out - outBuf)) |
| 845 | { |
| 846 | LOGD("write %d failed in deflate\n", |
| 847 | (int) (zstream.next_out - outBuf)); |
| 848 | goto z_bail; |
| 849 | } |
| 850 | |
| 851 | zstream.next_out = outBuf; |
| 852 | zstream.avail_out = kBufSize; |
| 853 | } |
| 854 | } while (zerr == Z_OK); |
| 855 | |
| 856 | assert(zerr == Z_STREAM_END); /* other errors should've been caught */ |
| 857 | |
| 858 | *pCRC32 = crc; |
| 859 | |
| 860 | z_bail: |
| 861 | deflateEnd(&zstream); /* free up any allocated structures */ |
| 862 | |
| 863 | bail: |
| 864 | delete[] inBuf; |
| 865 | delete[] outBuf; |
| 866 | |
| 867 | return result; |
| 868 | } |
| 869 | |
| 870 | /* |
| 871 | * Mark an entry as deleted. |
| 872 | * |
| 873 | * We will eventually need to crunch the file down, but if several files |
| 874 | * are being removed (perhaps as part of an "update" process) we can make |
| 875 | * things considerably faster by deferring the removal to "flush" time. |
| 876 | */ |
| 877 | status_t ZipFile::remove(ZipEntry* pEntry) |
| 878 | { |
| 879 | /* |
| 880 | * Should verify that pEntry is actually part of this archive, and |
| 881 | * not some stray ZipEntry from a different file. |
| 882 | */ |
| 883 | |
| 884 | /* mark entry as deleted, and mark archive as dirty */ |
| 885 | pEntry->setDeleted(); |
| 886 | mNeedCDRewrite = true; |
| 887 | return NO_ERROR; |
| 888 | } |
| 889 | |
| 890 | /* |
| 891 | * Flush any pending writes. |
| 892 | * |
| 893 | * In particular, this will crunch out deleted entries, and write the |
| 894 | * Central Directory and EOCD if we have stomped on them. |
| 895 | */ |
| 896 | status_t ZipFile::flush(void) |
| 897 | { |
| 898 | status_t result = NO_ERROR; |
| 899 | long eocdPosn; |
| 900 | int i, count; |
| 901 | |
| 902 | if (mReadOnly) |
| 903 | return INVALID_OPERATION; |
| 904 | if (!mNeedCDRewrite) |
| 905 | return NO_ERROR; |
| 906 | |
| 907 | assert(mZipFp != NULL); |
| 908 | |
| 909 | result = crunchArchive(); |
| 910 | if (result != NO_ERROR) |
| 911 | return result; |
| 912 | |
| 913 | if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) |
| 914 | return UNKNOWN_ERROR; |
| 915 | |
| 916 | count = mEntries.size(); |
| 917 | for (i = 0; i < count; i++) { |
| 918 | ZipEntry* pEntry = mEntries[i]; |
| 919 | pEntry->mCDE.write(mZipFp); |
| 920 | } |
| 921 | |
| 922 | eocdPosn = ftell(mZipFp); |
| 923 | mEOCD.mCentralDirSize = eocdPosn - mEOCD.mCentralDirOffset; |
| 924 | |
| 925 | mEOCD.write(mZipFp); |
| 926 | |
| 927 | /* |
| 928 | * If we had some stuff bloat up during compression and get replaced |
| 929 | * with plain files, or if we deleted some entries, there's a lot |
| 930 | * of wasted space at the end of the file. Remove it now. |
| 931 | */ |
| 932 | if (ftruncate(fileno(mZipFp), ftell(mZipFp)) != 0) { |
| 933 | LOGW("ftruncate failed %ld: %s\n", ftell(mZipFp), strerror(errno)); |
| 934 | // not fatal |
| 935 | } |
| 936 | |
| 937 | /* should we clear the "newly added" flag in all entries now? */ |
| 938 | |
| 939 | mNeedCDRewrite = false; |
| 940 | return NO_ERROR; |
| 941 | } |
| 942 | |
| 943 | /* |
| 944 | * Crunch deleted files out of an archive by shifting the later files down. |
| 945 | * |
| 946 | * Because we're not using a temp file, we do the operation inside the |
| 947 | * current file. |
| 948 | */ |
| 949 | status_t ZipFile::crunchArchive(void) |
| 950 | { |
| 951 | status_t result = NO_ERROR; |
| 952 | int i, count; |
| 953 | long delCount, adjust; |
| 954 | |
| 955 | #if 0 |
| 956 | printf("CONTENTS:\n"); |
| 957 | for (i = 0; i < (int) mEntries.size(); i++) { |
| 958 | printf(" %d: lfhOff=%ld del=%d\n", |
| 959 | i, mEntries[i]->getLFHOffset(), mEntries[i]->getDeleted()); |
| 960 | } |
| 961 | printf(" END is %ld\n", (long) mEOCD.mCentralDirOffset); |
| 962 | #endif |
| 963 | |
| 964 | /* |
| 965 | * Roll through the set of files, shifting them as appropriate. We |
| 966 | * could probably get a slight performance improvement by sliding |
| 967 | * multiple files down at once (because we could use larger reads |
| 968 | * when operating on batches of small files), but it's not that useful. |
| 969 | */ |
| 970 | count = mEntries.size(); |
| 971 | delCount = adjust = 0; |
| 972 | for (i = 0; i < count; i++) { |
| 973 | ZipEntry* pEntry = mEntries[i]; |
| 974 | long span; |
| 975 | |
| 976 | if (pEntry->getLFHOffset() != 0) { |
| 977 | long nextOffset; |
| 978 | |
| 979 | /* Get the length of this entry by finding the offset |
| 980 | * of the next entry. Directory entries don't have |
| 981 | * file offsets, so we need to find the next non-directory |
| 982 | * entry. |
| 983 | */ |
| 984 | nextOffset = 0; |
| 985 | for (int ii = i+1; nextOffset == 0 && ii < count; ii++) |
| 986 | nextOffset = mEntries[ii]->getLFHOffset(); |
| 987 | if (nextOffset == 0) |
| 988 | nextOffset = mEOCD.mCentralDirOffset; |
| 989 | span = nextOffset - pEntry->getLFHOffset(); |
| 990 | |
| 991 | assert(span >= ZipEntry::LocalFileHeader::kLFHLen); |
| 992 | } else { |
| 993 | /* This is a directory entry. It doesn't have |
| 994 | * any actual file contents, so there's no need to |
| 995 | * move anything. |
| 996 | */ |
| 997 | span = 0; |
| 998 | } |
| 999 | |
| 1000 | //printf("+++ %d: off=%ld span=%ld del=%d [count=%d]\n", |
| 1001 | // i, pEntry->getLFHOffset(), span, pEntry->getDeleted(), count); |
| 1002 | |
| 1003 | if (pEntry->getDeleted()) { |
| 1004 | adjust += span; |
| 1005 | delCount++; |
| 1006 | |
| 1007 | delete pEntry; |
| 1008 | mEntries.removeAt(i); |
| 1009 | |
| 1010 | /* adjust loop control */ |
| 1011 | count--; |
| 1012 | i--; |
| 1013 | } else if (span != 0 && adjust > 0) { |
| 1014 | /* shuffle this entry back */ |
| 1015 | //printf("+++ Shuffling '%s' back %ld\n", |
| 1016 | // pEntry->getFileName(), adjust); |
| 1017 | result = filemove(mZipFp, pEntry->getLFHOffset() - adjust, |
| 1018 | pEntry->getLFHOffset(), span); |
| 1019 | if (result != NO_ERROR) { |
| 1020 | /* this is why you use a temp file */ |
| 1021 | LOGE("error during crunch - archive is toast\n"); |
| 1022 | return result; |
| 1023 | } |
| 1024 | |
| 1025 | pEntry->setLFHOffset(pEntry->getLFHOffset() - adjust); |
| 1026 | } |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * Fix EOCD info. We have to wait until the end to do some of this |
| 1031 | * because we use mCentralDirOffset to determine "span" for the |
| 1032 | * last entry. |
| 1033 | */ |
| 1034 | mEOCD.mCentralDirOffset -= adjust; |
| 1035 | mEOCD.mNumEntries -= delCount; |
| 1036 | mEOCD.mTotalNumEntries -= delCount; |
| 1037 | mEOCD.mCentralDirSize = 0; // mark invalid; set by flush() |
| 1038 | |
| 1039 | assert(mEOCD.mNumEntries == mEOCD.mTotalNumEntries); |
| 1040 | assert(mEOCD.mNumEntries == count); |
| 1041 | |
| 1042 | return result; |
| 1043 | } |
| 1044 | |
| 1045 | /* |
| 1046 | * Works like memmove(), but on pieces of a file. |
| 1047 | */ |
| 1048 | status_t ZipFile::filemove(FILE* fp, off_t dst, off_t src, size_t n) |
| 1049 | { |
| 1050 | if (dst == src || n <= 0) |
| 1051 | return NO_ERROR; |
| 1052 | |
| 1053 | unsigned char readBuf[32768]; |
| 1054 | |
| 1055 | if (dst < src) { |
| 1056 | /* shift stuff toward start of file; must read from start */ |
| 1057 | while (n != 0) { |
| 1058 | size_t getSize = sizeof(readBuf); |
| 1059 | if (getSize > n) |
| 1060 | getSize = n; |
| 1061 | |
| 1062 | if (fseek(fp, (long) src, SEEK_SET) != 0) { |
| 1063 | LOGD("filemove src seek %ld failed\n", (long) src); |
| 1064 | return UNKNOWN_ERROR; |
| 1065 | } |
| 1066 | |
| 1067 | if (fread(readBuf, 1, getSize, fp) != getSize) { |
| 1068 | LOGD("filemove read %ld off=%ld failed\n", |
| 1069 | (long) getSize, (long) src); |
| 1070 | return UNKNOWN_ERROR; |
| 1071 | } |
| 1072 | |
| 1073 | if (fseek(fp, (long) dst, SEEK_SET) != 0) { |
| 1074 | LOGD("filemove dst seek %ld failed\n", (long) dst); |
| 1075 | return UNKNOWN_ERROR; |
| 1076 | } |
| 1077 | |
| 1078 | if (fwrite(readBuf, 1, getSize, fp) != getSize) { |
| 1079 | LOGD("filemove write %ld off=%ld failed\n", |
| 1080 | (long) getSize, (long) dst); |
| 1081 | return UNKNOWN_ERROR; |
| 1082 | } |
| 1083 | |
| 1084 | src += getSize; |
| 1085 | dst += getSize; |
| 1086 | n -= getSize; |
| 1087 | } |
| 1088 | } else { |
| 1089 | /* shift stuff toward end of file; must read from end */ |
| 1090 | assert(false); // write this someday, maybe |
| 1091 | return UNKNOWN_ERROR; |
| 1092 | } |
| 1093 | |
| 1094 | return NO_ERROR; |
| 1095 | } |
| 1096 | |
| 1097 | |
| 1098 | /* |
| 1099 | * Get the modification time from a file descriptor. |
| 1100 | */ |
| 1101 | time_t ZipFile::getModTime(int fd) |
| 1102 | { |
| 1103 | struct stat sb; |
| 1104 | |
| 1105 | if (fstat(fd, &sb) < 0) { |
| 1106 | LOGD("HEY: fstat on fd %d failed\n", fd); |
| 1107 | return (time_t) -1; |
| 1108 | } |
| 1109 | |
| 1110 | return sb.st_mtime; |
| 1111 | } |
| 1112 | |
| 1113 | |
| 1114 | #if 0 /* this is a bad idea */ |
| 1115 | /* |
| 1116 | * Get a copy of the Zip file descriptor. |
| 1117 | * |
| 1118 | * We don't allow this if the file was opened read-write because we tend |
| 1119 | * to leave the file contents in an uncertain state between calls to |
| 1120 | * flush(). The duplicated file descriptor should only be valid for reads. |
| 1121 | */ |
| 1122 | int ZipFile::getZipFd(void) const |
| 1123 | { |
| 1124 | if (!mReadOnly) |
| 1125 | return INVALID_OPERATION; |
| 1126 | assert(mZipFp != NULL); |
| 1127 | |
| 1128 | int fd; |
| 1129 | fd = dup(fileno(mZipFp)); |
| 1130 | if (fd < 0) { |
| 1131 | LOGD("didn't work, errno=%d\n", errno); |
| 1132 | } |
| 1133 | |
| 1134 | return fd; |
| 1135 | } |
| 1136 | #endif |
| 1137 | |
| 1138 | |
| 1139 | #if 0 |
| 1140 | /* |
| 1141 | * Expand data. |
| 1142 | */ |
| 1143 | bool ZipFile::uncompress(const ZipEntry* pEntry, void* buf) const |
| 1144 | { |
| 1145 | return false; |
| 1146 | } |
| 1147 | #endif |
| 1148 | |
| 1149 | // free the memory when you're done |
| 1150 | void* ZipFile::uncompress(const ZipEntry* entry) |
| 1151 | { |
| 1152 | size_t unlen = entry->getUncompressedLen(); |
| 1153 | size_t clen = entry->getCompressedLen(); |
| 1154 | |
| 1155 | void* buf = malloc(unlen); |
| 1156 | if (buf == NULL) { |
| 1157 | return NULL; |
| 1158 | } |
| 1159 | |
| 1160 | fseek(mZipFp, 0, SEEK_SET); |
| 1161 | |
| 1162 | off_t offset = entry->getFileOffset(); |
| 1163 | if (fseek(mZipFp, offset, SEEK_SET) != 0) { |
| 1164 | goto bail; |
| 1165 | } |
| 1166 | |
| 1167 | switch (entry->getCompressionMethod()) |
| 1168 | { |
| 1169 | case ZipEntry::kCompressStored: { |
| 1170 | ssize_t amt = fread(buf, 1, unlen, mZipFp); |
| 1171 | if (amt != (ssize_t)unlen) { |
| 1172 | goto bail; |
| 1173 | } |
| 1174 | #if 0 |
| 1175 | printf("data...\n"); |
| 1176 | const unsigned char* p = (unsigned char*)buf; |
| 1177 | const unsigned char* end = p+unlen; |
| 1178 | for (int i=0; i<32 && p < end; i++) { |
| 1179 | printf("0x%08x ", (int)(offset+(i*0x10))); |
| 1180 | for (int j=0; j<0x10 && p < end; j++) { |
| 1181 | printf(" %02x", *p); |
| 1182 | p++; |
| 1183 | } |
| 1184 | printf("\n"); |
| 1185 | } |
| 1186 | #endif |
| 1187 | |
| 1188 | } |
| 1189 | break; |
| 1190 | case ZipEntry::kCompressDeflated: { |
| 1191 | if (!ZipUtils::inflateToBuffer(mZipFp, buf, unlen, clen)) { |
| 1192 | goto bail; |
| 1193 | } |
| 1194 | } |
| 1195 | break; |
| 1196 | default: |
| 1197 | goto bail; |
| 1198 | } |
| 1199 | return buf; |
| 1200 | |
| 1201 | bail: |
| 1202 | free(buf); |
| 1203 | return NULL; |
| 1204 | } |
| 1205 | |
| 1206 | |
| 1207 | /* |
| 1208 | * =========================================================================== |
| 1209 | * ZipFile::EndOfCentralDir |
| 1210 | * =========================================================================== |
| 1211 | */ |
| 1212 | |
| 1213 | /* |
| 1214 | * Read the end-of-central-dir fields. |
| 1215 | * |
| 1216 | * "buf" should be positioned at the EOCD signature, and should contain |
| 1217 | * the entire EOCD area including the comment. |
| 1218 | */ |
| 1219 | status_t ZipFile::EndOfCentralDir::readBuf(const unsigned char* buf, int len) |
| 1220 | { |
| 1221 | /* don't allow re-use */ |
| 1222 | assert(mComment == NULL); |
| 1223 | |
| 1224 | if (len < kEOCDLen) { |
| 1225 | /* looks like ZIP file got truncated */ |
| 1226 | LOGD(" Zip EOCD: expected >= %d bytes, found %d\n", |
| 1227 | kEOCDLen, len); |
| 1228 | return INVALID_OPERATION; |
| 1229 | } |
| 1230 | |
| 1231 | /* this should probably be an assert() */ |
| 1232 | if (ZipEntry::getLongLE(&buf[0x00]) != kSignature) |
| 1233 | return UNKNOWN_ERROR; |
| 1234 | |
| 1235 | mDiskNumber = ZipEntry::getShortLE(&buf[0x04]); |
| 1236 | mDiskWithCentralDir = ZipEntry::getShortLE(&buf[0x06]); |
| 1237 | mNumEntries = ZipEntry::getShortLE(&buf[0x08]); |
| 1238 | mTotalNumEntries = ZipEntry::getShortLE(&buf[0x0a]); |
| 1239 | mCentralDirSize = ZipEntry::getLongLE(&buf[0x0c]); |
| 1240 | mCentralDirOffset = ZipEntry::getLongLE(&buf[0x10]); |
| 1241 | mCommentLen = ZipEntry::getShortLE(&buf[0x14]); |
| 1242 | |
| 1243 | // TODO: validate mCentralDirOffset |
| 1244 | |
| 1245 | if (mCommentLen > 0) { |
| 1246 | if (kEOCDLen + mCommentLen > len) { |
| 1247 | LOGD("EOCD(%d) + comment(%d) exceeds len (%d)\n", |
| 1248 | kEOCDLen, mCommentLen, len); |
| 1249 | return UNKNOWN_ERROR; |
| 1250 | } |
| 1251 | mComment = new unsigned char[mCommentLen]; |
| 1252 | memcpy(mComment, buf + kEOCDLen, mCommentLen); |
| 1253 | } |
| 1254 | |
| 1255 | return NO_ERROR; |
| 1256 | } |
| 1257 | |
| 1258 | /* |
| 1259 | * Write an end-of-central-directory section. |
| 1260 | */ |
| 1261 | status_t ZipFile::EndOfCentralDir::write(FILE* fp) |
| 1262 | { |
| 1263 | unsigned char buf[kEOCDLen]; |
| 1264 | |
| 1265 | ZipEntry::putLongLE(&buf[0x00], kSignature); |
| 1266 | ZipEntry::putShortLE(&buf[0x04], mDiskNumber); |
| 1267 | ZipEntry::putShortLE(&buf[0x06], mDiskWithCentralDir); |
| 1268 | ZipEntry::putShortLE(&buf[0x08], mNumEntries); |
| 1269 | ZipEntry::putShortLE(&buf[0x0a], mTotalNumEntries); |
| 1270 | ZipEntry::putLongLE(&buf[0x0c], mCentralDirSize); |
| 1271 | ZipEntry::putLongLE(&buf[0x10], mCentralDirOffset); |
| 1272 | ZipEntry::putShortLE(&buf[0x14], mCommentLen); |
| 1273 | |
| 1274 | if (fwrite(buf, 1, kEOCDLen, fp) != kEOCDLen) |
| 1275 | return UNKNOWN_ERROR; |
| 1276 | if (mCommentLen > 0) { |
| 1277 | assert(mComment != NULL); |
| 1278 | if (fwrite(mComment, mCommentLen, 1, fp) != mCommentLen) |
| 1279 | return UNKNOWN_ERROR; |
| 1280 | } |
| 1281 | |
| 1282 | return NO_ERROR; |
| 1283 | } |
| 1284 | |
| 1285 | /* |
| 1286 | * Dump the contents of an EndOfCentralDir object. |
| 1287 | */ |
| 1288 | void ZipFile::EndOfCentralDir::dump(void) const |
| 1289 | { |
| 1290 | LOGD(" EndOfCentralDir contents:\n"); |
| 1291 | LOGD(" diskNum=%u diskWCD=%u numEnt=%u totalNumEnt=%u\n", |
| 1292 | mDiskNumber, mDiskWithCentralDir, mNumEntries, mTotalNumEntries); |
| 1293 | LOGD(" centDirSize=%lu centDirOff=%lu commentLen=%u\n", |
| 1294 | mCentralDirSize, mCentralDirOffset, mCommentLen); |
| 1295 | } |
| 1296 | |